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July 21, 2026

Lead Software Engineer – C# / .NET

Senior • Hybrid

Warsaw, Poland

About the Role

We are looking for an experienced Lead Software Engineer with strong expertise in C#/.NET to take technical ownership of high-volume, distributed systems supporting critical processes. This is a hands-on leadership role combining software architecture and development with technical guidance and mentoring of a small engineering team.

You will work closely with global technology and operations teams to expand and modernize the platform, while contributing to its ongoing evolution towards Rust.

Responsibilities

  • Design and develop scalable, reliable, and high-performance distributed systems using C#/.NET.
  • Remain hands-on with software development, technical design, and code reviews.
  • Contribute to the modernization of the platform and migration from C#/.NET to Rust.
  • Support the integration of new products and capabilities into the platform.
  • Define technical standards, architecture principles, and development best practices.
  • Leverage AI-assisted development tools to improve engineering productivity and delivery.
  • Mentor engineers and provide technical guidance to a small team.
  • Translate business requirements into effective technical solutions.
  • Drive technical roadmaps, balancing short-term delivery with long-term platform scalability and reliability.

Requirements

  • 5+ years of professional software engineering experience with proven technical leadership.
  • Strong expertise in C#/.NET and distributed, service-oriented architectures.
  • Good understanding of concurrent and high-performance programming.
  • Experience designing scalable, resilient, and high-volume systems.
  • Willingness and openness to working with Rust as part of the platform's ongoing technology evolution.
  • Experience with AI-assisted software development and modern engineering practices.
  • Knowledge of DevOps practices and tools such as Git, Jenkins, JIRA, or similar.
  • Strong communication and stakeholder management skills.
  • Experience mentoring developers or providing technical leadership.

Nice to Have

  • Previous experience with Rust.
  • Knowledge of AWS, Kafka, serverless, or cloud-native architectures.
  • Experience with React or Angular.
  • Familiarity with event-driven architectures.
  • Experience in financial markets.

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